A large elongated area of high pressure will center itself over our region for the weekend giving us sunny skies and warm temperatures with low dew points.
Fair skies both days . Saturday high temperature 83 and Sunday high temperature 88 . Dew points remain in the comfortable 50s until Sunday evening. Enjoy!
An intensifying low pressure system in eastern Canada will bring a frontal boundary through our area Saturday afternoon.
Conflicting instability indexes and lift indexes do not give a good handle on the chance of showers or thunderstorms for Saturday afternoon. Considerable cloudiness expected. The NAM cranks out showers/thunderstorms , mostly late afternoon. The GFS consistently has had the precipitation “jump” past the PHL area; The GFS MOS still shows a moderate chance of thunderstorms between 4-7PM. High temperatures are forecast to be near 88, but I think that may be too high.
I will use the HRRR model Saturday morning to get a better handle on the chances for thunderstorms. Check back for an update.
For Sunday, a pool of unseasonably cold air aloft and an upper cyclonic flow will like result in sunshine leading to instability cloudiness and even a chance of pop-up showers, even though the models keep us dry at this time. Windy. Again, the models are forecasting a high of 85, but I think that is too high.
The models seem to be consistent and in fairly good agreement with this weekend’s weather forecast.
Saturday will have a damp, humid, southerly flow maintaining mostly cloudy skies, with some brightening and maybe some sun midday. Clouds return in the afternoon and there’s a chance of showers moving in from the west by 4-6 pm. High 80.
Rain develops Saturday night and continues through Sunday. There may be a lull in the rain during the morning but heavy rain and possible thunderstorms developing Sunday afternoon ahead of a cold front. High 79